Model Number: 3" filtration system-#4037
Brand Name: Duoling
Key Specifications/Special Features:
Brand name: DuolingModel number: water filterVoltage: 220VPower(W): 200WCertification: ISO 9001: 2008Warranty: one yearUsage: liquid filterMaterial: plasticSize: 3”compact; 3"; 3”SuperAccuracy: 5um-800umOEM: YesManufacturer: YesAuto backwash: YesAdvantagesConstant filtering efficiency: As core element of filter, the uniformity of groove style filtering superposition piece reaches to international first rate standard. The filter is in effect for all kinds of suspension impurity including inorganic and organic impurity.High efficiency backwash, energy and water saving The unit of backwash will be finished for 7-20 sec only. In general, the amount of consumed water in backwash is less than 0.5% of amount of filtering water. For viscosity impurity, high effective washing also be reached. The suitable scope is wider.Full automatic control, flow continuously: The filtering and backwash may be carried out at the same time. The loss of pressure and flow rate produced by automatic maintenance of system is less. The backwash is carried out in turn one by one and the others work normally.Low cost, reliable and long service life System: The system has been identified through IS9002 international quality system. And all the products are tested overall before sold. It's almost without daily maintenance, installation and convenient operation, reliability transportation.

Working principle of endogenous backwash systemThe water to be treated comes from the inlet pipe to the two-position three-way valves. Under control of the valves, the water goes through each disc filter unit while the system is doing the filtration process. Water after filtering comes from inside of the filter units to the outlet port. When the filter units gather more impurities and the pressure difference reaches the setting value or the system reaches the setting time, the system will shift to backwash mode. For example, if the PLC gives a signal to the two-position three-way valve of the first filter unit, the valve will close the inlet port and open the drain port while the flow direction will change. The filtered water comes from the outlet pipe to the inside of the filter unit. With water pressure the filter unit generates a centrifugal helical effect which moves the particles away from the discs, and the sewage after backwash will discharge through the drain port. After that the filter unit comes back to filtration mode, and the system will make next filter unit do backwash mode. So the filter unit will do backwash one by one, when some unit is under backwash mode, others can still keep filtration state. When the pressure of water comes from outlet pipe is under 0.2MPa, an electric butterfly valve is needed to be installed in outlet pipe to meet the pressure requirements for backwash.